Audio & Video Tools
Trim, convert, compress, join, and analyse audio and video without uploading a single byte. Waveforms, spectrograms, thumbnails and ID3 tags are handled by your browser's own media APIs, and format conversion runs on a self-hosted ffmpeg engine compiled to WebAssembly. Nothing is sent to a server, and the tools keep working offline once the engine has been cached.
Most popular
- audio-videoAudio Trimmer● ready
Drag the handles on a real waveform, pick a format, and export only the audio you need — MP3 and WAV clips are copied, not re-encoded.
- audio-videoVideo Trimmer● ready
Scrub the preview, mark in and out at the playhead, and export — stream copy for speed, or frame-accurate re-encode when precision matters.
- audio-videoVideo → GIF● ready
Turn any clip into a looping GIF with a two-pass colour palette, frame-rate, width and dithering controls.
- audio-videoVideo Compressor● ready
Shrink a video with a quality slider or a target file size, switch codecs, downscale, and see the exact before/after saving.
- audio-videoExtract Audio● ready
Turn any video into MP3, WAV, M4A, OGG, FLAC or AAC — optionally loudness-normalised on the way out.
Trim & Cut
- audio-videoAudio Trimmer● ready
Drag the handles on a real waveform, pick a format, and export only the audio you need — MP3 and WAV clips are copied, not re-encoded.
- audio-videoVideo Trimmer● ready
Scrub the preview, mark in and out at the playhead, and export — stream copy for speed, or frame-accurate re-encode when precision matters.
- audio-videoSilence Trimmer● ready
See loudness over time, set a threshold, and strip dead air from the start and end of a recording — or shorten gaps in the middle.
- audio-videoRingtone Maker● ready
Pick up to 40 seconds of any track, add smooth fades, and export an M4A or MP3 ringtone.
- audio-videoFrame Extractor● ready
Pull a still at any timestamp or export a batch of evenly spaced frames as a single ZIP — decoded by your browser, pixel-exact.
- audio-videoThumbnail Generator● ready
Scrub, pick a platform preset (YouTube, Reels, Open Graph), optionally burn in a title, and export a perfectly sized thumbnail.
Convert
- audio-videoAudio Converter● ready
Convert MP3, WAV, OGG, M4A, AAC, FLAC and Opus locally with bitrate, sample rate, mono and metadata options.
- audio-videoVideo Converter● ready
Convert MP4, WebM, MOV, MKV or AVI locally with a choice of H.264, MPEG-4, VP8 or VP9, resolution downscaling and audio bitrate.
- audio-videoVideo → GIF● ready
Turn any clip into a looping GIF with a two-pass colour palette, frame-rate, width and dithering controls.
- audio-videoExtract Audio● ready
Turn any video into MP3, WAV, M4A, OGG, FLAC or AAC — optionally loudness-normalised on the way out.
- audio-videoMute Video● ready
Delete the audio track with a stream copy, so the video keeps its exact resolution, codec and quality.
- audio-videoID3 Editor● ready
Read every ID3 frame, edit title/artist/album/track/genre/comment, replace cover art, and save without re-encoding.
- audio-videoVideo Metadata● ready
Read codec, profile, resolution, frame rate, bitrate, stream tags and container details — with a JSON export.
Edit & Process
- audio-videoAudio Compressor● ready
Shrink audio by choosing a bitrate, sample rate and channel layout — with a live size estimate and the real before/after result.
- audio-videoVideo Compressor● ready
Shrink a video with a quality slider or a target file size, switch codecs, downscale, and see the exact before/after saving.
- audio-videoAudio Normalizer● ready
Measure real loudness, then normalize to −16 LUFS (podcast), −14 LUFS (Spotify/YouTube) or a custom peak ceiling.
- audio-videoSpeed & Pitch● ready
Change tempo without chipmunking voices, or shift the musical key without changing the length — independently, with presets.
- audio-videoVideo Speed● ready
Create time-lapses or slow motion from any clip, with automatic audio pitch correction that keeps voices natural.
- audio-videoFade Editor● ready
Set independent fade-in and fade-out lengths, pick a curve, preview the envelope, and export in the original format.
- audio-videoAudio Merger● ready
Join any number of clips in your chosen order, with an optional crossfade between each pair.
- audio-videoVideo Merger● ready
Concatenate clips in any order — stream copy for identical footage, or re-encode to normalise resolution, frame rate and silent clips.
- audio-videoResize & Crop● ready
Resize to exact dimensions or crop to platform aspect ratios (1:1, 9:16, 16:9, 4:5) with crop, pad or stretch modes.
- audio-videoRotate & Flip● ready
Rotate or mirror any video and bake the change into the pixels, so it looks right in every player and editor.
- audio-videoVideo Watermarker● ready
Add a crisp text or logo watermark at any corner, with opacity, size and margin controls — the overlay is drawn at full resolution.
Analyse & Transcribe
- audio-videoWaveform Generator● ready
Turn any audio into a waveform image — mirror, bars or line styles, custom colours, transparent PNG or scalable SVG.
- audio-videoSpectrogram● ready
Visualise frequency content over time with FFT analysis, four colour maps and adjustable dynamic range.
- audio-videoFile Transcriber● ready
Transcribe an existing recording on-device with Whisper, then export the text or timed subtitles as TXT, SRT, VTT or JSON.
All tools
- audio-videoAudio Trimmer● ready
Drag the handles on a real waveform, pick a format, and export only the audio you need — MP3 and WAV clips are copied, not re-encoded.
- audio-videoAudio Converter● ready
Convert MP3, WAV, OGG, M4A, AAC, FLAC and Opus locally with bitrate, sample rate, mono and metadata options.
- audio-videoVideo Trimmer● ready
Scrub the preview, mark in and out at the playhead, and export — stream copy for speed, or frame-accurate re-encode when precision matters.
- audio-videoSilence Trimmer● ready
See loudness over time, set a threshold, and strip dead air from the start and end of a recording — or shorten gaps in the middle.
- audio-videoRingtone Maker● ready
Pick up to 40 seconds of any track, add smooth fades, and export an M4A or MP3 ringtone.
- audio-videoFrame Extractor● ready
Pull a still at any timestamp or export a batch of evenly spaced frames as a single ZIP — decoded by your browser, pixel-exact.
- audio-videoThumbnail Generator● ready
Scrub, pick a platform preset (YouTube, Reels, Open Graph), optionally burn in a title, and export a perfectly sized thumbnail.
- audio-videoVideo → GIF● ready
Turn any clip into a looping GIF with a two-pass colour palette, frame-rate, width and dithering controls.
- audio-videoVideo Converter● ready
Convert MP4, WebM, MOV, MKV or AVI locally with a choice of H.264, MPEG-4, VP8 or VP9, resolution downscaling and audio bitrate.
- audio-videoExtract Audio● ready
Turn any video into MP3, WAV, M4A, OGG, FLAC or AAC — optionally loudness-normalised on the way out.
- audio-videoMute Video● ready
Delete the audio track with a stream copy, so the video keeps its exact resolution, codec and quality.
- audio-videoID3 Editor● ready
Read every ID3 frame, edit title/artist/album/track/genre/comment, replace cover art, and save without re-encoding.
- audio-videoVideo Metadata● ready
Read codec, profile, resolution, frame rate, bitrate, stream tags and container details — with a JSON export.
- audio-videoVideo Compressor● ready
Shrink a video with a quality slider or a target file size, switch codecs, downscale, and see the exact before/after saving.
- audio-videoAudio Compressor● ready
Shrink audio by choosing a bitrate, sample rate and channel layout — with a live size estimate and the real before/after result.
- audio-videoSpeed & Pitch● ready
Change tempo without chipmunking voices, or shift the musical key without changing the length — independently, with presets.
- audio-videoVideo Speed● ready
Create time-lapses or slow motion from any clip, with automatic audio pitch correction that keeps voices natural.
- audio-videoAudio Normalizer● ready
Measure real loudness, then normalize to −16 LUFS (podcast), −14 LUFS (Spotify/YouTube) or a custom peak ceiling.
- audio-videoFade Editor● ready
Set independent fade-in and fade-out lengths, pick a curve, preview the envelope, and export in the original format.
- audio-videoResize & Crop● ready
Resize to exact dimensions or crop to platform aspect ratios (1:1, 9:16, 16:9, 4:5) with crop, pad or stretch modes.
- audio-videoRotate & Flip● ready
Rotate or mirror any video and bake the change into the pixels, so it looks right in every player and editor.
- audio-videoVideo Watermarker● ready
Add a crisp text or logo watermark at any corner, with opacity, size and margin controls — the overlay is drawn at full resolution.
- audio-videoAudio Merger● ready
Join any number of clips in your chosen order, with an optional crossfade between each pair.
- audio-videoVideo Merger● ready
Concatenate clips in any order — stream copy for identical footage, or re-encode to normalise resolution, frame rate and silent clips.
- audio-videoWaveform Generator● ready
Turn any audio into a waveform image — mirror, bars or line styles, custom colours, transparent PNG or scalable SVG.
- audio-videoSpectrogram● ready
Visualise frequency content over time with FFT analysis, four colour maps and adjustable dynamic range.
- audio-videoFile Transcriber● ready
Transcribe an existing recording on-device with Whisper, then export the text or timed subtitles as TXT, SRT, VTT or JSON.
About Audio & Video Tools
Audio and video files are usually far too personal or too large to upload to a random converter site. These tools run entirely client-side: the media engine is ffmpeg compiled to WebAssembly and served from this domain, waveform and spectrogram rendering use the Web Audio API, frame grabs and thumbnail compositing use canvas, and the file transcriber runs Whisper on your own device. Cut a ringtone, convert MP4 to WebM, extract a soundtrack, normalise a podcast to −16 LUFS, or export subtitles from a recording — all locally.
Related categories
Frequently asked questions
Are my audio and video files uploaded anywhere?
No. Every tool in this category runs in your browser: the media engine is WebAssembly served from this site, the audio analysis uses the Web Audio API, and frame and thumbnail work happens on a canvas. There is no upload step and no server-side processing.
Why does the first conversion take longer?
The ffmpeg engine is about 31 MB of WebAssembly and is downloaded on first use, then cached by the browser. The speech recognition model is about 39 MB and behaves the same way. After that first fetch, conversions start immediately.
Which formats are supported?
Audio: MP3, WAV, OGG Vorbis, AAC/M4A, FLAC and Opus. Video: MP4, WebM, MOV, MKV and AVI for input, with MP4 (H.264/MPEG-4), WebM (VP8/VP9), MOV and animated GIF for output. Stream copy is used whenever it avoids a re-encode.
How fast is in-browser video encoding?
The engine runs single-threaded, so a re-encode takes roughly the clip's own length or a little longer. Operations that only rewrite a container — trimming with copy, removing an audio track — finish in seconds regardless of length.
Will converting reduce the quality of my file?
Only operations that re-encode can affect quality, and those give you a quality control. Trimming with the copy option, removing audio, and editing ID3 tags never touch the original frames, so they are lossless and instant.